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Full text of "Monthly performance report : Zein Mechanical"

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SOLAR/1057-78/07 



Monthly 

Performance 

Report 



ZEIN MECHANICAL 
JULY 1978 









•_ 



<t 







U.S. Department of Energy 




National Solar Heating and 
Cooling Demonstration Program 

National Solar Data Program 



NOTICE 

This report was prepared as an account of work sponsored by the United States 
Government. Neither the United States nor the United States Department of Energy, nor 
any of their employees, nor any of their contractors, subcontractors, or their employees, 
make any warranty, express or implied, or assume any legal liability or responsibility for 
the accuracy, completeness or usefulness of any information, apparatus, product or 
process disclosed, or represents that its use would not infringe privately owned rights. 



MONTHLY PERFORMANCE REPORT 
ZEIN MECHANICAL 
JULY 1978 

I. SYSTEM DESCRIPTION 

The Zein Mechanical site is a single family residence located in Milwaukee, 
Wisconsin. The home has two separate solar energy systems: an air syste- 
for space heating and cooling; a liquid system to preheat the potable hot 
water. The two systems are shown schematically in Figure 1 

The space heating system, designated Zein Mechanical No. 1, is designed to 
supply approximately 44 percent of the space heating requirements for the 
1,388 square foot residence. This system has a solar array of double- 
glazed acrylic collectors with a gross area of 384 square feet. The col- 
lectors, manufactured by Solaray, Inc., face south at an angle of 53 degrees 
from the horizontal. A fan circulates the solar heated air through the 
412.5 cubic foot rock thermal storage, across the heat pump coil, then 
back to the inlet side of collectors. Thus, the solar heated air assists 
the heat pump in providing thermal energy to the heat exchanger in the air 
handler. Auxiliary space heating energy is supplied by 4-kw and 6-kw 
electric strip heaters. In the summer, the heat pump can also function 
in the cooling cycle to maintain desired temperatures in the conditioned 
space. The solar energy system components, heat pump compressor, evaporator, 
circulating fan, and rock thermal storage dre located inside a sealed arc 
insulated room in the house basement. Excessive heat buildup in the rock 
thermal storage is rejected to the ouside ambient either through back- 
draft damper D5 , or through the collectors. 

The liquid system, designated Zein Mechanical No. 2, uses distilled water 
as the transfer medium. This system has a solar array witn a gross area 
of 77.6 square feet. The collectors, manufactured by Solarcraft , *ace 
south at an angle of 30 degrees from the horizontal. Solar heatec water 
flows through the heat exchanger within the 82-gallon domestic hot water 
(DHW) heater to preheat the domestic hot water. Auxiliary e r ergy * 



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hot water is provided by a 4.5-kw electric element in the DHW heater. For 
freeze protection, the DHW heater contains an interior chamber large enough 
to accommodate the collector loop distilled water when the system is not 
operating. The DHW system activates the collector pump to collect solar 
energy when the differential temperature between the collector outlet and 
the bottom of the hot water tank is greater than 10 degrees. When solar 
energy is unavailable, the pump deactivates to permit automatic draining. 

The Zein Mechanical No. 1 system has five modes of heating and five modes 
of cooling. A matrix of operating modes, damper positions and mode control 
temperature sensor conditions is shown in Table 1. 

Mode 1 - Storage-to-Space Heating : This winter mode is entered when there 
is a demand for space heating, the collector loop is not active, and the 
outside ambient temperature is less than 10°F above the rock thermal tem- 
perature. Air is drawn through motorized dampers from storage using the 
collector/heat pump circulating fan, past the heat pump evaporator coil, 
bypassing the collector, and back to storage. The heat pump condensor 
coil and house circulating fan supply energy to the house. Strip heaters 
supplement the heat pump to meet the heating demand. 

Mode 2 - Collector-to-Storage : This winter mode is entered when the col- 
lector outlet temperature is 10°F higher than a temperature representative 
of storage, and the outside ambient temperature is less than 10°F above 
the rock thermal storage temperature. Air is drawn from the collector 
using the collector/heat pump circulating fan into the rock thermal 
storage through motorized dampers and recirculated through the collector. 
There may or may not be a demand for space heating. 

M ode 3 - Outside Air-to-Storage (Heating) : This mode is entered when the 
collector loop is inactive, there is no demand for space heating, and the 
outside ambient temperature is greater than 10°F above the rock thermal 
storage temperature. Air is drawn from the outside using the collector/ 
heat pump circulating fan into the rock thermal storage through motorized 
dampers and then exhausted to the outside through a backdraft damper in 
the wall of the insulated room. 



TABLE 1 

Heating and Cooling Operating Mode Matrix 

WINTER HEATING OPERATING MODE 



MODE 


Tc-Tr 
> 10°F 


Ta-Tr 
> 10°F 


CALL FOR 
HEAT 


FAN 


DAM 


3 ER 


Dl 


D2 


D3 


D4 


OFF 


NO 


NO 


NO 


OFF 


C 








c 


1 


NO 


NO 


YES 


ON 


C 








c 


2 


YES 


NO 


- 


ON 





C 





c 


3 


NO 


YES 


NO 


ON 


C 





c 





4 


NO 


YES 


YES 


ON 


C 





c 





5 


YES 


YES 


- 


ON 





c 


c 






SUMMER COOLING OPERATING MODE 



MODE 


Tc-Tr 
< -10°F 


Ta-Tr 
£ -10°F 


CALL FOR 
COOLING 


FAN 


DAMPER 


Dl 


D2 


D3 


D4 


OFF 


NO 


NO 


NO 


OFF 


C 








C 


6 


NO 


NO 


YES 


ON 


C 








C 


7 


YES 


NO 


- 


ON 





C 





c 


8 


NO 


YES 


NO 


ON 


C 





C 





9 


NO 


YES 


YES 


ON 


C 





C 





10 


YES 


YES 


- 


ON 





c 


C 






MODE CONTROL TEMPERATURE SENSORS: 

Tc - TEMPERATURE OF COLLECTORS 

Ta - TEMPERATURE OF OUTSIDE AMBIENT AIR 

Tr - TEMPERATURE OF ROCK STORAGE 



Mode 4 - Outside Air-to-Space Heating : This winter mode is entered when 
there is a demand for space heating, the collector loop is not active, and 
the outside ambient temperature is greater than 10°F above the rock thermal 
storage temperature. Air is drawn from the outside through motorized 
dampers past the heat pump evaporator coil, through the rock thermal stor- 
age, and then exhausted to the outside through a backdraft damper in the 
wall of the insulated room. The heat pump condenser coil and house circu- 
lating fan supply energy to the house. Strip heaters supplement the heat 
pump to meet the heating demand. 

Mode 5 - Outside Air-to-Col lector (Heating) : This mode is entered when the 
difference in temperature between the collector outlet temperature is 10°F 
higher than a temperature representative of storage, and the outside ambient 
temperature is greater than 10°F above the rock thermal storage temperature. 
Air is drawn from outside using the collector/heat pump circulating fan, 
through the collector, into the rock thermal storage through motorized 
dampers and then exhausted to the outside. There may or may not be a de- 
mand for space heating. 

Mode 6 - Storage-to-Space Cooling : This summer mode is entered when there 
is a demand for space cooling, the collector loop is not active, and the 
storage temperature is less than 10°F above the outside ambient temperature. 
Air is drawn through motorized dampers from storage using the collector/ 
heat pump fan, past the heat pump condenser coil, by-passing the collector, 
and back to storage. The heat pump evaporator coil and house circulating 
fan remove energy from the house. 

Mode 7 - Collector Heat Rejection : This mode rejects storage energy by 
circulating air through the collectors at night. This summer mode is 
entered when the temperature of the storage is more than 10°F higher than 
the collector outlet temperature, and the storage temperature is less 
than 10°F above the outside ambient temperature. Air is drawn from the 



collector at night using the collector/heat pump circulating fan into 
storage, through motorized dampers, and recirculated through the collector. 
There may or may not be a demand for space cooling. 

Mode 8 - Storage Heat Rejection : This mode is entered when the collector 
loop is inactive, there is no demand for space cooling, and the rock 
thermal storage temperature is greater than 1 0°F above the outside 
ambient temperature. Air is drawn from the outside using the collector/ 
heat pump circulating fan into the rock thermal storage, through motorized 
dampers, and then exhausted to the outside through a backdraft damper in 
the wall of the insulated room. 

Mode 9 - Outside Air-to-Space Cooling : This summer mode is entered when 
there is a demand for space cooling, the coolector loop is not active, and 
the rock thermal storage temperature is greater than 10°F above the outside 
ambient temperature. Air is drawn from the outside through motorized 
dampers to the heat pump, past the heat pump condenser coil, through the 
rock thermal storage, and then exhausted to the outside through a back- 
draft damper in the wall of the insulated room. The heat pump evaporator 
coil and house circulating fan remove energy from the house to meet the 
cooling load. 

Mode 10 - Outside Air-to-Collector (Cooling) : This mode is entered when 
the temperature of the rock thermal storage is 10°F lower than the col- 
lector outlet temperature, and the rock thermal storage temperature is 
greater than 10°F above the outside ambient temperature. Air is drawn 
from outside through the collector using the collector/heat pump circulat- 
ing fan, into the rock thermal storage, through motorized dampers, and 
then exhausted to the outside. There may or may not be a demand for space 
cooling. 



II. PERFORMANCE EVALUATION 

A. Introduction 

The system performance evaluations discussed in this section are based 
primarily on the analysis of the data presented in the attached computer- 
generated monthly report. This attached report consists of daily site 
thermal and energy values for each subsystem, plus environmental data. The 
performance factors discussed in this report are based upon the definitions 
contained in NBSIR-76-1137, Thermal Data Requirements and Performance Eval- 
uation Procedures for the National Solar Heating and Cooling Demonstration 
Program. 

The Zein Mechanical site is an unoccupied model home. Because it is un- 
occupied, the house had a low space heating, space cooling, and hot water 
demand. The Zein Mechanical site operated only in the auxiliary cooling 
modes during July. 

No space heating demand was predicted or measured during the month of July. 

The water solar energy system satisfied 69 percent of the DHW demand of 
0.02 million Btu with a resultant savings of 0.25 million Btu (74 kwh) of 
electrical energy. 

The space cooling system was operated in the summer cooling Modes 6,9, and 
10, and in the rock bed energy rejection Modes 7 and 8. The space cooling 
system satisfied the space cooling demand of 0.85 million Btu using the 
heat pump auxiliary. The heat pump coefficient of performance was approxi- 
mately 1.67, which is considerably less than the predicted performance of 
2.5 for the heat pump in the cooling mode. 

Although not part of the solar energy system, the space cooling system 
performance is indicated in the Extra Load Subsystem Report. Also, the 
heat pump space cooling performance is shown in the Auxiliary Thermo- 
dynamic Conversion Equipment Report. Refer to attached computer-generated 
printout for this cooling data. 



B. Weather 

The cloud cover in July was significantly above normal, as indicated by 

comparing the measured insolation with the predicted long-term monthly 

insolation. The insolation available on the solar energy system collector 

arrays during the month averaged 1,269 Btu/ft -day, which is significantly 

2 
less than the 1,647 Btu/ft -day expected for the month. This is computed 

using an algorithm to estimate the insolation on a tilted surface from 

the long-term insolation data (on a horizontal surface) derived from 

measurements taken at the airport in Milwaukee, Wisconsin. 

The measured ambient temperature was 69°F, which is 1°F lower than the 
70°F predicted for July. 

C. Space Heating System Thermal Performance 

Collector - The collection system operated only to reject energy accumulated 
in storage due to operation of the heat pump in the cooling modes. No solar 
energy collection occurred. 

Storage - No solar energy was collected or delivered to storage. However, 
operation of the space heating system actually provided 1.22 million Btu 
of evaporator cooling energy to the rock thermal storage. 

Space Heating Load - During July, no space heating load was expected or 
measured. There were 15 heating degree-days measured at the site. 

D. Domestic Hot Water Thermal Performance 

Collector - Of the 3.05 million Btu of solar energy incident on the col- 
lector array during July, 0.76 million Btu were incident on the array when 
the collector circulating pump was operating. The system collected 0.39 
million Btu, or 13 percent of the total insolation incident on the collector 



array. The operation of the collector circulating pump required 0.03 mil- 
lion Btu of electrical energy. The collection subsystem was inactive during 
significant periods of the month. 

Storage - Of the 0.76 million Btu of solar energy collected, 0.28 million 
Btu were delivered to storage. A total of 0.02 million Btu were extracted 
from storage and delivered to the space heating and domestic hot water 
demand. The storage thermal loss was 0.26 million Btu. The relatively 
high loss is due to the low consumption of hot water because the model 
home is unoccupied. Thermal loss from the transport system between the 
collector array and storage amounted to 0.48 million Btu, or 63 percent 
of the collected energy. 

Domestic Hot Water Load - An average of one gallon of hot water was used 
each day and delivered at an average temperature of 136°F. The hot water 
was replaced with cold water at an average temperature of 63°F, which re- 
sulted in a hot water load of 0.02 million Btu. In order to satisfy this 
load and maintain domestic hot water average temperature at 136°F, 0.51 
million Btu were supplied to the tank. Of the 0.51 million Btu supplied 
to the tank, 0.28 million Btu were supplied by solar energy and 0.23 million 
Btu were supplied by auxiliary electrical energy, resulting in a solar con- 
tribution to the load of 69 percent. 

E. Space Cooling System 

The space cooling demand was 0.85 million Btu, which was provided entirely 
by the heat pump. The space cooling load was significantly higher than ex- 
pected for July due to having the control thermostat set at 70 C F, and also 
to the requirement to remove uncontrolled energy lost from the insulated 
room containing the storage. The energy removed from the building during 
cooling was transferred to the rock bed. Thus, the storage temperature 
increased to near 100°F. The resultant losses from storage were trans- 
ferred to the building. This rock bed/building interaction created the 



larger-than-expected cooling load. In addition, the collector energy re- 
jection mode was insufficient to remove enough energy to prevent the 
occurrence of this problem. The coefficient of performance of the heat 
pump in the cooling mode was 1.67 as compared to a predicted coefficient 
of 2.5 for this heat pump operating under the measured weather conditions. 

F. Observations 

The poor heat pump performance is probably due partially to the measurement 
inaccuracies of the air flow sensors at the site. The elimination of known 
duct leaks is necessary to obtain an accurate energy balance for the system. 
To identify the duct leaks, a duct flow survey would have to be completed 
at the inlet and outlet of each major subsystem and at the sensor locations, 

Conditioned space cooling was provided entirely by the heat pump auxiliary. 
The space cooling load was significantly higher than expected for July. 
A considerable amount of energy was stored in the rock bed. The collector 
subsystem heat rejection mode was insufficient in removing rock bed heat. 
The resulting rock bed/insulated room losses added energy to the condi- 
tioned space, causing an increased cooling load. An analysis of the 
operation of the heat pump cooling modes should be undertaken. It would 
be desirable if the heat pump energy was rejected to the outside and not 
stored in storage when in cooling modes. 

G. Energy Savings 

The Zein Mechanical solar energy system for space heating was inoperative 
during the month of July. Thus, no savings were accrued. 

The Zein Mechanical domestic hot water savings were 0.25 million Btu. The 
energy savings are based on the energy requirements of a conventional 
domestic hot water tank compared to the energy requirements of the solar 
energy system. The energy conversion efficiency from electrical to thermal 
energy was assumed to be 100 percent. 



10 



III. ACTION STATUS 

Minor instrumentation problems exist at the site. Site rework activity is 
necessary to survey air ducts to determine an accurate energy balance for 
the space heating system. Some temperature probes should be replaced. 

A large air flow leak has been detected in the plenum system of the space 
heating collectors. The air leaks must be isolated and sealed in order 
for the system to perform to design specifications. 

The data system experienced significant loss of data during the month. The 
collector outlet temperature was erratic - sometimes indicating properly, 
and other times, indicating a zero output. 



11 



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